mm/damon/core: fix divide error in damon_nr_accesses_to_accesses_bp()
commit5ff6e2fff8
upstream. If 'aggr_interval' is smaller than 'sample_interval', max_nr_accesses in damon_nr_accesses_to_accesses_bp() becomes zero which leads to divide error, let's validate the values of them in damon_set_attrs() to fix it, which similar to others attrs check. Link: https://lkml.kernel.org/r/20230527032101.167788-1-wangkefeng.wang@huawei.com Fixes:2f5bef5a59
("mm/damon/core: update monitoring results for new monitoring attributes") Reported-by: syzbot+841a46899768ec7bec67@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=841a46899768ec7bec67 Link: https://lore.kernel.org/damon/00000000000055fc4e05fc975bc2@google.com/ Reviewed-by: SeongJae Park <sj@kernel.org> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -551,6 +551,8 @@ int damon_set_attrs(struct damon_ctx *ctx, struct damon_attrs *attrs)
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return -EINVAL;
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if (attrs->min_nr_regions > attrs->max_nr_regions)
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return -EINVAL;
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if (attrs->sample_interval > attrs->aggr_interval)
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return -EINVAL;
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damon_update_monitoring_results(ctx, attrs);
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ctx->attrs = *attrs;
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